I have tried this in Windows 10 2004 and windows 1909. On windows 2004 Adobe standard 2015 is being used. If I have preview enabled in windows I can open other files fine such as excel or word.However if the Adobe pdf is multiple pages long, double clicking it won't open it. Sometimes after pdf shows in explorer preview, I can double click it. Sometimes it takes 5 double clicks and pdf file opens. I have the same issue on a Windows 10 1909 with Adobe Reader DC. Once preview is disabled in windows explorer, pdf's open fine on double click.